Author: Christophe Theron
Date: 06:49:29 03/12/02
Go up one level in this thread
On March 12, 2002 at 04:44:59, Uri Blass wrote:
>On March 11, 2002 at 23:08:48, Fernando Villegas wrote:
>
>>This sunday, around 9:30 in the night, IM Pablo Toloza did a good show of his
>>acute tactical awareness coming to my home five minutes before the dinner was
>>served. Yes, in Chile as in the rest of Latin America, the custom is going to
>>dinne very late, some times not before eleven. Pablo was welcome; he is a
>>mundane and nice kind of guy that likes, as he say, "to weep his lips" with a
>>couple of wine glasses and even somewhat more if the brand is of his taste and
>>the talk is good. And although his real work is as a computer expert consultor
>>in an electric engineering company, he likes to perform as well as my personal
>>"computer guru" when the neccesary fixes surpass my modest knowledge. This time
>>the iron to fix was an Iomega Zip unit, something that was a marvel only two
>>years ago, but it is by now, with plenty CD burning devices available, a piece
>>of museum. But I need it as much I have some preciate software and docs in half
>>a dozen zip disks.
>>Sooner Pablo discovered my Palm unit and asked if I had some chess progam into
>>it. "Of course" I said, "I have Tiger".
>>He winkled and said he knew Genius and that he thought well of it. "Just low
>>expert level at most, but good enough for such a tiny device". I responded that
>>perhaps Tiger could do better than that. He smiled. "You always consider your
>>programs as the very best... well, put your Palm where the board is..."
>>So I did and for giving to the ocasion an extra clout I put on the desk my very
>>best board, a wonderful crafted piece of wood bought to Steven in the ocassion
>>of one of his sales-out.
>>
>>And so the following game was played. The time accorded was five minutes, to the
>>finish. For a program running in a normal PC, that's is equal to suicide for the
>>human side, but Pablo knew well that Tiger, performing in the very slow
>>processor of Palm, could not search more than 250 moves per second in the ending
>>and a lot less in middlegame. So, for an IM with long experience in the killing
>>blitz played in the main Chess Club of Santiago, - a somewhat bohemian place
>>similar to a room for playing billiards, full of cigar smoke and agressive
>>people crowding over every board to make despective comments in loud voice, a
>>real nightmaret- it was a chance to crush the beast to the utmost.
>>And the game begun. Tiger was favoured with an overclocked processor running at
>>32 Mhz and Pablo was overclocked with a new ration of one of my best cabernets.
>>
>>
>>[Site: my home in Santiago
>>[Date "2002.03.11"]
>>[Round 1
>>[White IM Pablo Toloza
>>[Black "Chess Tiger"]
>>5 minutes the full game.
>>
>>1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bd3 Be7
>>8. O-O O-O
>>
>>"...well, until now at least this thing knows something of opennings" said
>>Pablo.
>>
>>9. Re1 cxd4 10. exd4 Ncb4 11. Bb1 Bd7 12. Ne5 Rc8 13. Bd2 Qc7
>>
>>
>>At this stage Pablo was very confident. "Not a very imaginative playing"
>>commented. "And yours?" I asked. "Oh" he answered, "I am just just toying with
>>him..."
>>
>>14. a3 Nxc3 15. bxc3 Nd5 16. c4 Nf6 17. Bf4 b6???
>>
>>An horrible move, but there it was in the screen. In the screen, also, appeared
>>the following data: Tiger was looking only 3 plys deep. He was also taking only
>>some seconds to decide a move. I thought, for a moment, to declare the game
>>already lost and give the full point to Pablo, but I resisted. I had some hopes.
>>Pablo just laughed. He asked another ration of you know what. I served also one
>>for myself.
>
>3 plies are enough to avoid the blunder b6
>(at least for my stupid program)
>
>b6 is the first ply
>Ng6 is the second ply
>Bd6 is the third ply and the rest is qsearch.
>
>Maybe palm tiger prune Ng6 because the square g6 is threatened by 2 pawns
>With some extensions avoiding b6 may be only 2 ply because Ng6 is a good
>candidate for extension thanks for the fact that it threats the queen and the
>rook and not only for pruning.
>
>Uri
Well if you want to write a program that searches really deep you must find ways
to prune the tree... And Tiger prunes like a kamikaze.
And sometimes it fails miserably, as in this game.
Actually I think I'm going to remove the pruning system that caused the problem.
It turns out to be really too dangerous. It was a novelty of version 14.6, and
maybe not such a good idea after all...
Christophe
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